I reside in a residential building equipped with a 30-line analog voice intercom system. Additionally, I have a Dahua KTP02 Video Intercom Kit (VTO + VTH) installed at the garden door. I'm exploring the possibility of connecting a wire from the intercom headset to the Alarm IN port on the VTH unit. My intention is to utilize this setup to automatically activate the display of the ONVIF camera located beside the building's analog intercom. Essentially, pressing the intercom call button would serve two functions: ringing the handset and triggering the alarm on the VTH unit.